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Sagot :

AYUDA

bjr

on développe

7*6 + 7*(-2x) - 3*4x - 3*1 = 0

42   -    14x    - 12x   - 3   = 0

on réduit

-36x + 39 = 0

-36x = -39

x = 39/36

on simplifie..

x = 13/12

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